.54 round ball rifling?

[shorthair]

My .58 uses a.562 Rb with a 72 inch twist and can group under an inch at 100 yds with 60 to 140 grains of 3f. Never could get as good with 2f.

 

[Rudyard]

Remarkable shooting are you talking heavy bench gun or a one shot group?. If neither then the U S International team will want to recruit you .
Rudyard